If you have spent any time comparing NMN supplements, you will have seen the word bioavailability on almost every label. Some brands claim three times the absorption. Some claim ten. A few claim ninety per cent. The honest answer is more careful than any of those numbers.
This guide explains what bioavailability means in the context of NMN, what the published research has actually measured, and how to read a product label without getting drawn in by figures that were never designed to describe an oral supplement. We sell both a standard NMN (Ivvion Essential) and a liposomal NMN (Ivvion Elite), and we will tell you plainly where the evidence is strong and where it is still being built.
What "bioavailability" means
Bioavailability is the percentage of an ingested compound that reaches the bloodstream in an active form. A vitamin C tablet might have a bioavailability of 30–40% — the rest is broken down, excreted, or never absorbed. For NMN, the same logic applies: how much of the molecule that you swallow ends up circulating in your body.
Bioavailability is shaped by three things:
- Whether the digestive process breaks the molecule down before absorption.
- Whether the gut wall can transport the molecule efficiently.
- Whether liver metabolism removes the molecule before it can circulate (the "first-pass" effect).
The point of any specialised delivery format — sublingual tablets, liposomes, time-release capsules — is to influence one of those three steps.
How NMN is absorbed
NMN is a small water-soluble molecule. Published pharmacokinetic studies in humans have shown that orally administered NMN appears in blood plasma within minutes of ingestion, and is then converted to NAD+ inside cells. That is meaningful: it tells us standard, unencapsulated NMN does reach the bloodstream after oral administration. The research base that supports NMN as a category — the human trials people cite when they explain why NMN is interesting — was built almost entirely on standard NMN powder in capsule form, not on specialised delivery systems.
That is the first thing to understand. The evidence that NMN reaches circulation when taken orally exists. The question of whether one delivery format reaches circulation better than another is separate, and the answer is less settled.
The four common NMN delivery formats
1. Powder in a capsule. The standard format. The capsule dissolves in the stomach, the powder mixes with gastric contents, and absorption happens primarily in the small intestine. This is the form used in almost all published NMN human trials.
2. Loose powder (sublingual or in water). Some users place NMN powder under the tongue, believing it absorbs through the oral mucosa. The theoretical case is reasonable — sublingual absorption bypasses the digestive tract — but the published research on sublingual NMN specifically is thin, and the time the powder needs to sit under the tongue is longer than most people realise.
3. Liposomal NMN. The NMN molecule is encased in a tiny phospholipid bubble (a liposome). The theory: the liposome protects NMN from stomach acid and digestive enzymes, and merges with cell membranes to deliver its contents more directly. Liposomal delivery is well established for some compounds (vitamin C, glutathione). For NMN specifically, the human pharmacokinetic data is limited and the absorption advantage often quoted on labels is extrapolated from related research, not measured directly in published peer-reviewed NMN-specific human trials at the time of writing.
4. Sublingual lozenge or tablet. Designed to dissolve slowly in the mouth. Same theoretical basis as loose powder under the tongue, but easier to use. Again, the published research base is small.
Where the "10x bioavailability" claims come from — and why we don't make them
You will see labels that claim 80%, 90%, even 95% bioavailability for liposomal supplements. Those figures are almost always borrowed from IV drug delivery studies for entirely different compounds. They were not measured for oral NMN. Carrying them across to a food supplement label is, at best, sloppy. At worst it is misleading.
The fairer framing is this: liposomal delivery has a plausible mechanism for improving absorption of certain molecules, and for NMN specifically the formal evidence is still being built. We think the theory is interesting enough to offer a liposomal option (Ivvion Elite), but we will not put a number on the label that the research does not support.
How to compare NMN products without being misled
Five practical filters when you read a label:
- Look for the actual NMN dose, not just "complex" weights. A 1,000 mg "blend" can contain anything. The dose that matters is the NMN itself.
- Ignore percentage claims that don't cite the study. Real pharmacokinetic data is publishable and citable. If a brand can't tell you which study a "5x absorption" claim comes from, treat the number as marketing.
- Look for third-party purity testing. Some early NMN products tested below the dose on their label. Reputable brands publish Certificates of Analysis.
- Check the form of NMN. Beta-NMN is the active form. Some cheap powders are racemic mixes that include the inactive enantiomer.
- Read the small print on shipping and storage. Liposomes can be temperature-sensitive. Powders can be moisture-sensitive. A great formulation that arrives damaged is no better than a mediocre one.
The Ivvion approach
We make two NMN products on purpose.
Ivvion Essential is a 500 mg/day standard NMN capsule, made with pharmaceutical-grade beta-NMN, third-party tested, and priced to make daily use practical. It is the form the published NMN research has been built on. For most people starting NMN it is the sensible choice.
Ivvion Elite is a 1,000 mg/day liposomal NMN, formulated for users who want the higher dose and the liposomal delivery format. We do not put a multiplier number on the label. We tell you what it is and let you decide.
FAQ
Is liposomal NMN definitely better absorbed?
Not definitely. The mechanism is plausible. The peer-reviewed human pharmacokinetic data comparing liposomal and standard NMN head-to-head is limited at the time of writing.
Does that mean liposomal is a marketing gimmick?
No. It means the evidence is still being built. We think it is interesting enough to make a high-quality liposomal product available. We are not willing to put a fabricated percentage on the label.
Does sublingual NMN work better than swallowed NMN?
Theoretically, possibly. In practice, the powder needs to sit under your tongue for several minutes, and many people swallow it long before that happens. The convenience of a capsule is part of why most published research uses capsules.
Will NMN survive my stomach acid?
Some NMN is degraded in the digestive tract. Published research shows that meaningful quantities still reach circulation when taken as a standard oral dose.
Food supplement. Not a medicine. Does not diagnose, treat, cure or prevent any disease. Speak to your GP if you take prescription medication or have a medical condition.